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comparison src/share/vm/code/scopeDesc.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children 9987d9d5eb0e
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // SimpleScopeDesc is used when all you need to extract from
26 // a given pc,nmethod pair is a methodOop and a bci. This is
27 // quite a bit faster than allocating a full ScopeDesc, but
28 // very limited in abilities.
29
30 class SimpleScopeDesc : public StackObj {
31 private:
32 methodOop _method;
33 int _bci;
34
35 public:
36 SimpleScopeDesc(nmethod* code,address pc) {
37 PcDesc* pc_desc = code->pc_desc_at(pc);
38 assert(pc_desc != NULL, "Must be able to find matching PcDesc");
39 DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());
40 int ignore_sender = buffer.read_int();
41 _method = methodOop(buffer.read_oop());
42 _bci = buffer.read_bci();
43 }
44
45 methodOop method() { return _method; }
46 int bci() { return _bci; }
47 };
48
49 // ScopeDescs contain the information that makes source-level debugging of
50 // nmethods possible; each scopeDesc describes a method activation
51
52 class ScopeDesc : public ResourceObj {
53 public:
54 // Constructor
55 ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset);
56
57 // Calls above, giving default value of "serialized_null" to the
58 // "obj_decode_offset" argument. (We don't use a default argument to
59 // avoid a .hpp-.hpp dependency.)
60 ScopeDesc(const nmethod* code, int decode_offset);
61
62 // JVM state
63 methodHandle method() const { return _method; }
64 int bci() const { return _bci; }
65
66 GrowableArray<ScopeValue*>* locals();
67 GrowableArray<ScopeValue*>* expressions();
68 GrowableArray<MonitorValue*>* monitors();
69 GrowableArray<ScopeValue*>* objects();
70
71 // Stack walking, returns NULL if this is the outer most scope.
72 ScopeDesc* sender() const;
73
74 // Returns where the scope was decoded
75 int decode_offset() const { return _decode_offset; }
76
77 // Tells whether sender() returns NULL
78 bool is_top() const;
79 // Tells whether sd is equal to this
80 bool is_equal(ScopeDesc* sd) const;
81
82 private:
83 // Alternative constructor
84 ScopeDesc(const ScopeDesc* parent);
85
86 // JVM state
87 methodHandle _method;
88 int _bci;
89
90 // Decoding offsets
91 int _decode_offset;
92 int _sender_decode_offset;
93 int _locals_decode_offset;
94 int _expressions_decode_offset;
95 int _monitors_decode_offset;
96
97 // Object pool
98 GrowableArray<ScopeValue*>* _objects;
99
100 // Nmethod information
101 const nmethod* _code;
102
103 // Decoding operations
104 void decode_body();
105 GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);
106 GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);
107 GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);
108
109 DebugInfoReadStream* stream_at(int decode_offset) const;
110
111
112 public:
113 // Verification
114 void verify();
115
116 #ifndef PRODUCT
117 public:
118 // Printing support
119 void print_on(outputStream* st) const;
120 void print_on(outputStream* st, PcDesc* pd) const;
121 void print_value_on(outputStream* st) const;
122 #endif
123 };